<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(item) in cartInfoList" :key="item.id">
          <li class="cart-list-con1">
            <input type="checkbox"
                   name="chk_list"
                   :checked="item.isChecked === 1"
                   @change="updateChecked(item.skuId, $event)"
            >
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" alt="">
            <div class="item-msg">{{ item.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ item.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1, item)">-</a>
            <input autocomplete="off"
                   type="text"
                   minnum="1"
                   class="itxt"
                   :value="item.skuNum"
                   @change="handler('change',$event.target.value * 1,item)"
            >
            <a href="javascript:void(0)" class="plus" @click="handler('add',1,item)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuNum * item.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#" class="sindelet" @click="deleteCartById(item.skuId)">删除</a>
            <br>
            <a href="#">移到收藏</a>
          </li>
        </ul>

      </div>
    </div>

    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox"
               :checked="isAllCheck && cartInfoList.length !==0" @change="updateAllCartChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#">移到我的关注</a>
        <a href="#">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
<!--          <a class="sum-btn" @click="$router.push('/trade')">结算</a>-->
          <router-link class="sum-btn" to='/trade'>结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>

import throttle from 'lodash/throttle'
import {mapGetters} from "vuex";

export default {
  name: 'ShopCart',
  created() {
    this.getData()
  },
  computed: {
    ...mapGetters(['cartList']),
    //购物车数据
    cartInfoList() {
      return this.cartList.cartInfoList || []
    },
    //计算购买产品的总价
    totalPrice() {
      let sum = 0
      this.cartInfoList.forEach(item => {
        sum += item.skuNum * item.skuPrice
      })
      return sum
    },
    //判断底部复选框是否勾选 【全选】
    isAllCheck() {
      return this.cartInfoList.every(item => item.isChecked === 1)
    }

  },
  methods: {
    getData() {
      this.$store.dispatch('getCartList')
    },
    //修改一个产品的个数
    handler: throttle(async function (type, disNum, item) {
      //type 区分三个元素 disNum 变化量  item.skuNum 产品id
      //向服务器发请求修改数量
      switch (type) {
        case 'add':
          disNum = 1
          break;
        case 'change':
          //用户输入进来的最终数字，如果是非法的 (带有汉字|| 出现负数) 带给服务器 0
          if (isNaN(disNum) || disNum <= 1) {
            disNum = 0
          } else {
            //正常情况 (小数，取整) 带给服务器的变化量  用户输入 - 产品起始个数
            disNum = parseInt(disNum) - item.skuNum
          }
          // disNum = (isNaN(disNum) || disNum <= 1) ? 0 : parseInt(disNum) - item.skuNum
          break;
        case 'minus':
          //如果出现产品的个数小于等于1， 传递给服务器的个数0 (原封不动)
          disNum = item.skuNum > 1 ? -1 : 0
          break;
      }
      //修改成功
      await this.$store.dispatch('addOrUpdateShopCart', {
        skuId: item.skuId,
        skuNum: disNum
      })
      // 再一次获取服务器数据展示
      this.getData()
    }, 1000),
    //删除一个产品
    async deleteCartById(id) {
      try {
        await this.$store.dispatch('deleteCartListBySkuId', id)
        //如果删除成功再次发起请求获取新的数据
        this.getData()
      } catch (e) {
        alert(e.message())
      }
    },
    //修改一个产品属性
    async updateChecked(skuId, event) {
      try {
        //如果修改数据成功，再次获取服务器数据
        let isChecked = event.target.checked ? '1' : '0'
        await this.$store.dispatch('updateCheckedById', {skuId, isChecked})
        this.getData()
      } catch (e) {
        alert(e.message)
      }

    },
    //删除选择的商品
    async deleteAllCheckedCart() {
      try {
        //派发一个action
        await this.$store.dispatch('deleteAllCheckedCart');
        this.getData()
      } catch (e) {
        alert(e.message())
      }
    },
    //修改全部产品的选中状态
    async updateAllCartChecked(event) {
      try {
        let isChecked = event.target.checked ? '1' : '0'
        //派发acton
        await this.$store.dispatch('updateAllCartIsChecked', isChecked)
        this.getData()
      } catch (e) {
        alert(e.message)
      }

    }
  }

}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>